Studies of negatives have been focused on morphological, syntactic and logical levels.

学术界对于否定的研究侧重于形态、句法和逻辑层次。

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Desperate to make ends meet while still maintaining existing levels of services, they did the logical thing: They cried to Washington, D.

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The reason is that such a document spells out a logical asset allocation given one's financial goals, discusses the historical levels of volatility inherent in the chosen allocation and mentally prepares the investor for the harsh reality that periods of "black swan" events do happen.

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